Highly efficient orange-red phosphorescent organic light-emitting diode using 2,7-bis(carbazo-9-yl)-9,9-ditolyfluorene as the host

We demonstrate an efficient orange-red organic light-emitting diode using a host, 2,7-bis(carbazo-9-yl)-9,9-ditolyfluorene, doped with tris(2-phenylquinoline) iridium(III). The device exhibits a high current efficiency of 44.8 cd/A at 1000   cd / m 2 . This may be attributed to the adoption of the h...

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Bibliographic Details
Published in:Applied physics letters 2010-04, Vol.96 (14), p.143306-143306-3
Main Authors: Jou, Jwo-Huei, Shen, Shih-Ming, Chen, Szu-Hao, Wu, Ming-Hsuan, Wang, Wei-Ben, Wang, Hsi-Ching, Lin, Chuen-Ren, Chou, Yi-Chieh, Wu, Po-Hsien, Shyue, Jing-Jong
Format: Article
Language:English
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Summary:We demonstrate an efficient orange-red organic light-emitting diode using a host, 2,7-bis(carbazo-9-yl)-9,9-ditolyfluorene, doped with tris(2-phenylquinoline) iridium(III). The device exhibits a high current efficiency of 44.8 cd/A at 1000   cd / m 2 . This may be attributed to the adoption of the host, which favors the injection of holes, as well as the emissive-layer architecture enabling excitons to form on host and hence favoring efficient energy-transfer from host to guest. Moreover, an electron-confining layer is used to modulate excessive holes to be injected into emissive layer and confine the electrons, which would in turn balance the injection of both carriers and improve efficiency.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3374326